Abstract: The wide use of portable digital video devices makes it hard to transmit large-sized and high-resolution images under wireless conditions. This paper designs and realizes a technique,which is suitable for portable digital video devices, for transmitting medium-and large-sized high-resolution images based on DWT transform and the embedded bit stream technology,and then transfer clea r and appointed picture rapidly under low-bandwldth conditions. Experiments show that it has better flexibility in picture encoding and transmission under the wireless environment. The system we presented can support long-distance transmission services strongly and can improve the rapid response ability in unreliable wireless channels, so it can solve the matter of real-time interaction with each other.